160 lines
4.4 KiB
C
160 lines
4.4 KiB
C
#ifndef __V850_UACCESS_H__
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#define __V850_UACCESS_H__
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/*
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* User space memory access functions
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*/
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <asm/segment.h>
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#include <asm/machdep.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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extern inline int access_ok (int type, const void *addr, unsigned long size)
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{
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/* XXX I guess we should check against real ram bounds at least, and
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possibly make sure ADDR is not within the kernel.
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For now we just check to make sure it's not a small positive
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or negative value, as that will at least catch some kinds of
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error. In particular, we make sure that ADDR's not within the
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interrupt vector area, which we know starts at zero, or within the
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peripheral-I/O area, which is located just _before_ zero. */
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unsigned long val = (unsigned long)addr;
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return val >= (0x80 + NUM_CPU_IRQS*16) && val < 0xFFFFF000;
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}
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry
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{
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unsigned long insn, fixup;
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};
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/* Returns 0 if exception not found and fixup otherwise. */
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extern unsigned long search_exception_table (unsigned long);
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/*
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* These are the main single-value transfer routines. They automatically
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* use the right size if we just have the right pointer type.
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*/
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extern int bad_user_access_length (void);
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#define __get_user(var, ptr) \
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({ \
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int __gu_err = 0; \
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typeof(*(ptr)) __gu_val = 0; \
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switch (sizeof (*(ptr))) { \
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case 1: \
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case 2: \
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case 4: \
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__gu_val = *(ptr); \
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break; \
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case 8: \
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memcpy(&__gu_val, ptr, sizeof(__gu_val)); \
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break; \
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default: \
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__gu_val = 0; \
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__gu_err = __get_user_bad (); \
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break; \
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} \
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(var) = __gu_val; \
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__gu_err; \
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})
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#define __get_user_bad() (bad_user_access_length (), (-EFAULT))
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#define __put_user(var, ptr) \
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({ \
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int __pu_err = 0; \
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switch (sizeof (*(ptr))) { \
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case 1: \
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case 2: \
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case 4: \
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*(ptr) = (var); \
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break; \
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case 8: { \
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typeof(*(ptr)) __pu_val = 0; \
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memcpy(ptr, &__pu_val, sizeof(__pu_val)); \
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} \
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break; \
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default: \
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__pu_err = __put_user_bad (); \
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break; \
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} \
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__pu_err; \
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})
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#define __put_user_bad() (bad_user_access_length (), (-EFAULT))
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#define put_user(x, ptr) __put_user(x, ptr)
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#define get_user(x, ptr) __get_user(x, ptr)
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#define __copy_from_user(to, from, n) (memcpy (to, from, n), 0)
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#define __copy_to_user(to, from, n) (memcpy(to, from, n), 0)
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#define __copy_to_user_inatomic __copy_to_user
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#define __copy_from_user_inatomic __copy_from_user
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#define copy_from_user(to, from, n) __copy_from_user (to, from, n)
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#define copy_to_user(to, from, n) __copy_to_user(to, from, n)
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#define copy_to_user_ret(to,from,n,retval) \
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({ if (copy_to_user (to,from,n)) return retval; })
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#define copy_from_user_ret(to,from,n,retval) \
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({ if (copy_from_user (to,from,n)) return retval; })
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/*
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* Copy a null terminated string from userspace.
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*/
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static inline long
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strncpy_from_user (char *dst, const char *src, long count)
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{
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char *tmp;
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strncpy (dst, src, count);
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for (tmp = dst; *tmp && count > 0; tmp++, count--)
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;
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return tmp - dst;
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}
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/*
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* Return the size of a string (including the ending 0)
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*
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* Return 0 on exception, a value greater than N if too long
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*/
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static inline long strnlen_user (const char *src, long n)
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{
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return strlen (src) + 1;
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}
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#define strlen_user(str) strnlen_user (str, 32767)
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/*
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* Zero Userspace
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*/
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static inline unsigned long
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clear_user (void *to, unsigned long n)
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{
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memset (to, 0, n);
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return 0;
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}
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#endif /* __V850_UACCESS_H__ */
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